Stepping Stones

Stepping stones (~20, each a few feet across, flattened
tops of stalagmites), a underground chasm (vast,
foreboding in size and age), still water surface (black
as night), leads to a rocky island (50' across).
▶ Jump from stone to stone: Test agility DR10 once for
the entire crossing to avoid touching the water. Clever
methods like using a plank or rope circumvent testing.